I drew this for my own print of the Imperial Star Destroyer by nikoli2803 that was scaled up to 150% of the original. If your print is a scale other than 150%, use the STL file called 'SD Stand-667' and scale accordingly (100/150 = 0.667).
Note: I added some thickness to the sides of the "seat" where the drawing was too thin to print as seen in the photos of my print.
See print settings for recommendations.
3D Solutech PLA
Support angle set to 75 degrees. See photo. Infill as you please above 15%; I used 30%.